H21.303 ICD-10-CM Code: Idiopathic cysts of iris, ciliary body or anterior chamber, bilateral
H21.303 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software
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FY 2026 Apr update / Diseases of the eye and adnexa (H00-H59) / Disorders of sclera, cornea, iris and ciliary body (H15-H22)
H21.303
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceIdiopathic cysts of iris, ciliary body or anterior chamber, bilateral
Fluid-filled sacs in the iris or front part of the eye that develop without a known cause, affecting both eyes.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- Cyst of iris, ciliary body or anterior chamber NOSInherited from H21.30
Excludes 2
Official- certain conditions originating in the perinatal period (P04-P96)Inherited from H00-H59, H21, H21.3
- certain infectious and parasitic diseases (A00-B99)Inherited from H00-H59, H21, H21.3
- complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from H00-H59, H21, H21.3
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Inherited from H00-H59, H21, H21.3
- diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)Inherited from H00-H59, H21, H21.3
- endocrine, nutritional and metabolic diseases (E00-E88)Inherited from H00-H59, H21, H21.3
- injury (trauma) of eye and orbit (S05.-)Inherited from H00-H59, H21, H21.3
- injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from H00-H59, H21, H21.3
- neoplasms (C00-D49)Inherited from H00-H59, H21, H21.3
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from H00-H59, H21, H21.3
- syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)Inherited from H00-H59, H21, H21.3
- sympathetic uveitis (H44.1-)Inherited from H00-H59, H21, H21.3
- miotic pupillary cyst (H21.27-)Inherited from H00-H59, H21, H21.3
Related Codes
Includes
OfficialNo Includes notes are included in this display for H21.303. Check the code and parent instructions in the Code Book.
Excludes 1
OfficialNo Excludes 1 notes are included in this display for H21.303. Check the code and parent instructions in the Code Book.
Code First
OfficialNo Code First sequencing instructions are included in this display for H21.303. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for H21.303. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for H21.303. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is H21.303 an HCC code?
No. H21.303 is a billable ICD-10-CM code with no mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models.
- Code
- H21.303
- Description
- Idiopathic cysts of iris, ciliary body or anterior chamber, bilateral
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
H21.303 is the ICD-10-CM diagnosis code for idiopathic cysts of iris, ciliary body or anterior chamber, bilateral. Fluid-filled sacs in the iris or front part of the eye that develop without a known cause, affecting both eyes. H21.303 sits in the ICD-10-CM chapter for diseases of the eye and adnexa (h00-h59), within the section covering disorders of sclera, cornea, iris and ciliary body (h15-h22).
H21.303 is a billable ICD-10-CM code, but the current payload does not show a mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.
Verify bilateral involvement is documented before assigning this code; if only one eye is affected, use the appropriate unilateral code instead.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for H21.303 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify bilateral involvement is documented before assigning this code; if only one eye is affected, use the appropriate unilateral code instead.
- •Idiopathic cysts are those without an identifiable underlying cause; ensure the cyst type is not specified as exudative or implantation.